Feeling successful

Today's weight:  275.2
I honestly can't remember the last time I saw a number this low on the scale.  I'm worried it's not real-- that means I've lost over 1.5 lbs in a day?!?  In the last two days, I have added GNC's energy and metabolism vitamins, and I've upped my exercise to at least an hour a day.  Maybe it's really working?  Not going to over-analyze, just going to accept and be pleased with my efforts.  It's not about a number anyway, right?